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Simplifying 2(-1a + -8) + -15 = 9 Reorder the terms: 2(-8 + -1a) + -15 = 9 (-8 * 2 + -1a * 2) + -15 = 9 (-16 + -2a) + -15 = 9 Reorder the terms: -16 + -15 + -2a = 9 Combine like terms: -16 + -15 = -31 -31 + -2a = 9 Solving -31 + -2a = 9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '31' to each side of the equation. -31 + 31 + -2a = 9 + 31 Combine like terms: -31 + 31 = 0 0 + -2a = 9 + 31 -2a = 9 + 31 Combine like terms: 9 + 31 = 40 -2a = 40 Divide each side by '-2'. a = -20 Simplifying a = -20
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